Finite Element Analysis on 4-pole Radial Hybrid Magnetic Bearing with Separated Magnetic Ciruits

To eliminate the flux coupling and reduce the complexity of the control system, a novel 4-pole two degrees of freedom (2-DOF) radial hybrid magnetic bearing (RHMB) with independent magnetic circuits is proposed. In this radial hybrid magnetic bearing, the stator consists of the X-stator and Y-stator cores with curved poles. First, the configuration and suspension mechanism are analyzed. Then, the mathematical models of the suspension force are deduced using equivalent magnetic circuit method. Finally, the 3D finite element model is built based on Magnet 3D to verify the suspension mechanism and calculate the force-current relationships. The research results have shown that the structure is reasonable, suspension mechanism is correct, and the control fluxes in the X and Y directions are completely decoupled.